Morrisons are currently selling packs of 4 standard 500ml bottles of coke/diet/zero for £2. (They sell separately at £1 each, or 2 for £1.70). This is a good deal in itself, but for any collectors of cokezone points it is (as far as i know) the best way to bolster your points before the big 'end of era sell off' (see http://blog.cokezone.co.uk/2010/08/17/what-was-that-about/
). You receive a code worth 2 points for each of the small bottles in a pack (so £2 for 8 points = 4points per pound) This is in comparison with 3 x 2L bottles for £3 at sainsburys, which = 3points per pound. Also available at morrisons are the 12can fridge packs at 2 for £7 = 24points for £7 (or 3.4points per pound).
So to clarify - this is a good deal on these little bottles for lunches, picnics, etc, but it is not the cheapest way to buy coke as you are paying £1 per litre and at Sainsburys you can get 6L for £3! It is, however, the cheapest way to obtain cokezone points!
Hope this helps someone!